Improve data downloading.

src/core/feedsmodelfeed.cpp

@@ -145,7 +145,7 @@ QPair<FeedsModelFeed*, QNetworkReply::NetworkError> FeedsModelFeed::guessFeed(co
   }
 
   QByteArray feed_contents;
-  if ((result.second = NetworkFactory::downloadFeedFile(url,
+  if ((result.second = NetworkFactory::downloadFile(url,
                                                     qApp->settings()->value(APP_CFG_FEEDS, "feed_update_timeout", DOWNLOAD_TIMEOUT).toInt(),
                                                     feed_contents,
                                                     !username.isEmpty(),
@@ -349,12 +349,9 @@ QVariant FeedsModelFeed::data(int column, int role) const {
 void FeedsModelFeed::update() {
   QByteArray feed_contents;
   int download_timeout = qApp->settings()->value(APP_CFG_FEEDS, "feed_update_timeout", DOWNLOAD_TIMEOUT).toInt();
-  QNetworkReply::NetworkError download_result = NetworkFactory::downloadFeedFile(url(),
+  QNetworkReply::NetworkError download_result = NetworkFactory::downloadFile(url(), download_timeout,
-                                                                                 download_timeout,
+                                                                             feed_contents, passwordProtected(),
-                                                                                 feed_contents,
+                                                                             username(), password());
-                                                                                 passwordProtected(),
-                                                                                 username(),
-                                                                                 password());
 
   if (download_result != QNetworkReply::NoError) {
     qWarning("Error during fetching of new messages for feed '%s' (id %d).",

src/miscellaneous/systemfactory.cpp

@@ -152,7 +152,7 @@ QPair<UpdateInfo, QNetworkReply::NetworkError> SystemFactory::checkForUpdates()
   QPair<UpdateInfo, QNetworkReply::NetworkError> result;
   QByteArray releases_xml;
 
-  result.second = NetworkFactory::downloadFeedFile(RELEASES_LIST, DOWNLOAD_TIMEOUT, releases_xml);
+  result.second = NetworkFactory::downloadFile(RELEASES_LIST, DOWNLOAD_TIMEOUT, releases_xml);
 
   if (result.second == QNetworkReply::NoError) {
     result.first = parseUpdatesFile(releases_xml);

src/network-web/downloader.cpp

@@ -23,10 +23,8 @@
 
 
 Downloader::Downloader(QObject *parent)
-  : QObject(parent),
+  : QObject(parent), m_activeReply(NULL), m_downloadManager(new SilentNetworkAccessManager(this)),
-    m_activeReply(NULL),
+    m_timer(new QTimer(this)), m_lastOutputData(QByteArray()), m_lastOutputError(QNetworkReply::NoError) {
-    m_downloadManager(new SilentNetworkAccessManager(this)),
-    m_timer(new QTimer(this)) {
 
   m_timer->setInterval(DOWNLOAD_TIMEOUT);
   m_timer->setSingleShot(true);
@@ -39,7 +37,7 @@ Downloader::~Downloader() {
   m_downloadManager->deleteLater();
 }
 
-void Downloader::downloadFile(const QString &url, bool protected_contents,
+void Downloader::downloadFile(const QString &url, int timeout, bool protected_contents,
                               const QString &username, const QString &password) {
   QNetworkRequest request;
   QObject originatingObject;
@@ -75,13 +73,13 @@ void Downloader::finished(QNetworkReply *reply) {
   else {
     // No redirection is indicated. Final file is obtained in our "reply" object.
     // Read the data into output buffer.
-    QByteArray output = reply->readAll();
+    m_lastOutputData = reply->readAll();
-    QNetworkReply::NetworkError reply_error = reply->error();
+    m_lastOutputError = reply->error();
 
     m_activeReply->deleteLater();
     m_activeReply = NULL;
 
-    emit completed(reply_error, output);
+    emit completed(m_lastOutputError, m_lastOutputData);
   }
 }
 
@@ -107,3 +105,11 @@ void Downloader::runGetRequest(const QNetworkRequest &request) {
   connect(m_activeReply, SIGNAL(downloadProgress(qint64,qint64)),
           this, SLOT(progressInternal(qint64,qint64)));
 }
+
+QNetworkReply::NetworkError Downloader::lastOutputError() const {
+  return m_lastOutputError;
+}
+
+QByteArray Downloader::lastOutputData() const {
+  return m_lastOutputData;
+}

src/network-web/downloader.h

@@ -37,9 +37,13 @@ class Downloader : public QObject {
     explicit Downloader(QObject *parent = 0);
     virtual ~Downloader();
 
+    // Access to last received full output data/error.
+    QByteArray lastOutputData() const;
+    QNetworkReply::NetworkError lastOutputError() const;
+
   public slots:
     // Performs asynchronous download of given file. Redirections are handled.
-    void downloadFile(const QString &url, bool protected_contents = false,
+    void downloadFile(const QString &url, int timeout = DOWNLOAD_TIMEOUT, bool protected_contents = false,
                       const QString &username = QString(), const QString &password = QString());
 
   signals:
@@ -64,6 +68,9 @@ class Downloader : public QObject {
     QNetworkReply *m_activeReply;
     SilentNetworkAccessManager *m_downloadManager;
     QTimer *m_timer;
+
+    QByteArray m_lastOutputData;
+    QNetworkReply::NetworkError m_lastOutputError;
 };
 
 #endif // DOWNLOADER_H

src/network-web/networkfactory.cpp

@@ -20,6 +20,7 @@
 #include "definitions/definitions.h"
 #include "miscellaneous/settings.h"
 #include "network-web/silentnetworkaccessmanager.h"
+#include "network-web/downloader.h"
 
 #include <QEventLoop>
 #include <QTimer>
@@ -104,7 +105,7 @@ QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QString &url,
   QString google_s2_with_url = QString("http://www.google.com/s2/favicons?domain=%1").arg(Qt::escape(url));
 #endif
   QByteArray icon_data;
-  QNetworkReply::NetworkError network_result =  downloadFeedFile(google_s2_with_url, timeout, icon_data);
+  QNetworkReply::NetworkError network_result =  downloadFile(google_s2_with_url, timeout, icon_data);
 
   if (network_result == QNetworkReply::NoError) {
     QPixmap icon_pixmap;
@@ -115,101 +116,20 @@ QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QString &url,
   return network_result;
 }
 
-QNetworkReply::NetworkError NetworkFactory::downloadFeedFile(const QString &url,
+QNetworkReply::NetworkError NetworkFactory::downloadFile(const QString &url, int timeout,
-                                                             int timeout,
+                                                         QByteArray &output, bool protected_contents,
-                                                             QByteArray &output,
+                                                         const QString &username, const QString &password) {
-                                                             bool protected_contents,
+  // Here, we want to achieve "synchronous" approach because we want synchronout download API for
-                                                             const QString &username,
+  // some use-cases too.
-                                                             const QString &password) {
+  Downloader downloader;
-  // Original asynchronous behavior of QNetworkAccessManager
-  // is replaced by synchronous behavior in order to make
-  // process of downloading of a file easier to understand.
-
-  // Make necessary variables.
-  SilentNetworkAccessManager manager;
   QEventLoop loop;
-  QTimer timer;
-  QNetworkRequest request;
-  QNetworkReply *reply;
-  QObject originatingObject;
 
-  // Set credential information as originating object.
+  // We need to quit event loop when the download finishes.
-  originatingObject.setProperty("protected", protected_contents);
+  QObject::connect(&downloader, SIGNAL(completed(QNetworkReply::NetworkError)), &loop, SLOT(quit()));
-  originatingObject.setProperty("username", username);
-  originatingObject.setProperty("password", password);
-  request.setOriginatingObject(&originatingObject);
 
-  // Set url for this reques.
+  downloader.downloadFile(url, timeout, protected_contents, username, password);
-  request.setUrl(url);
-
-  // Create necessary connections.
-  QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
-  QObject::connect(&manager, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit()));
-
-  forever {
-    // This timer fires just ONCE.
-    timer.setSingleShot(true);
-
-    // Try to open communication channel.
-    reply = manager.get(request);
-
-    // Start the timeout timer.
-    timer.start(timeout);
-
-    // Enter the event loop.
   loop.exec();
+  output = downloader.lastOutputData();
 
-    // At this point one of two things happened:
+  return downloader.lastOutputError();
-    //  a) file download was completed,
-    //  b) communication timed-out.
-
-    if (timer.isActive()) {
-      // Download is complete because timer is still running.
-      timer.stop();
-    }
-    else {
-      if (reply != NULL) {
-        delete reply;
-        reply = NULL;
-      }
-
-      // Timer already fired. Download is NOT successful.
-      return QNetworkReply::TimeoutError;
-    }
-
-    // In this phase, some part of downloading process is completed.
-    QUrl redirection_url = reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl();
-
-    if (redirection_url.isValid()) {
-      // Communication indicates that HTTP redirection is needed.
-      // Setup redirection URL and download again.
-      request.setUrl(redirection_url);
-
-      delete reply;
-      reply = NULL;
-    }
-    else {
-      // No redirection is indicated. Final file is obtained
-      // in our "reply" object.
-      break;
-    }
-  }
-
-  // Read the data into output buffer.
-  output = reply->readAll();
-
-  QNetworkReply::NetworkError reply_error = reply->error();
-
-  qDebug("File '%s' fetched with status '%s' (code %d).",
-         qPrintable(url),
-         qPrintable(networkErrorText(reply_error)),
-         reply_error);
-
-  // Delete needed stuff and exit.
-  if (reply != NULL) {
-    delete reply;
-    reply = NULL;
-  }
-
-  return reply_error;
 }

src/network-web/networkfactory.h

@@ -41,7 +41,7 @@ class NetworkFactory {
 
     // Performs SYNCHRONOUS download of file with given URL
     // and given timeout.
-    static QNetworkReply::NetworkError downloadFeedFile(const QString &url,
+    static QNetworkReply::NetworkError downloadFile(const QString &url,
                                                         int timeout,
                                                         QByteArray &output,
                                                         bool protected_contents = false,